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  2. Why Cobalt Blue Is One of the Royals' Favorite Colors to Wear

    www.aol.com/lifestyle/why-cobalt-blue-one-royals...

    Cosmic Cobalt may be our 2025 Color of the Year, but this rich blue hue has long been a color of significance for royalty and ancient cultures, dating as far back as the 6th and 7th centuries B.C.

  3. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    Black gold is a type of gold used in jewelry. [13] [14] Black-colored gold can be produced by various methods: Patination by applying sulfur- and oxygen-containing compounds. Plasma-assisted chemical vapor deposition process involving amorphous carbon; Controlled oxidation of gold containing chromium or cobalt (e.g. 75% gold, 25% cobalt [3]).

  4. Stonesetting - Wikipedia

    en.wikipedia.org/wiki/Stonesetting

    As with all jewelry, there can be many variations of channel work. At times the walls will be raised—sometimes a center stone will be set between two bars that rise high from the base ring—or the channel may be cut directly into the surface, making the stones flush with the metal.

  5. The 7 Best Colors to Pair with Cobalt Blue, According to ...

    www.aol.com/lifestyle/7-best-colors-pair-cobalt...

    Here, the best colors to pair with cobalt blue. ... Set of 8. Shop Now. Antique 1820's Royal Crown Derby Imari Porcelain Plates - Set of 8 ... white, and gold.” ...

  6. Gemstone irradiation - Wikipedia

    en.wikipedia.org/wiki/Gemstone_irradiation

    Gemstone irradiation is a process in which a gemstone is exposed to artificial radiation in order to enhance its optical properties.High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice, which in turn alters the optical properties within it. [1]

  7. Jewellery - Wikipedia

    en.wikipedia.org/wiki/Jewellery

    By 1500 BC, the peoples of the Indus Valley were creating gold earrings and necklaces, bead necklaces, and metallic bangles. Before 2100 BC, prior to the period when metals were widely used, the largest jewellery trade in the Indus Valley region was the bead trade. Beads in the Indus Valley were made using simple techniques.

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